All Questions
507
questions
2
votes
0
answers
45
views
"Leaked in-place lambda" warning after an upgrade to Kotlin 2.0
Consider the following Kotlin code which overloads Reader.useLines(). The 1st extension merely invokes Reader.useLines() and has an exactly the same contract, the 2nd one filters the line sequence ...
- 5,242
-2
votes
1
answer
45
views
In Kotlin, is it possible to change the reference in a closure?
The idea is that you pass a lambda to a class and you want to change the implementation after it is passed to the class, but the class does not expose any way to update the lambda's implementation.
As ...
- 882
2
votes
1
answer
58
views
Compose Conditional Modifier Not Working Properly
I tried making an extension function on Modifier to apply changes to it only if a condition was true, since quite frequently I need to make small changes to a Modifier object in case certain things ...
0
votes
2
answers
97
views
Kotlin generic lambda Type mismatch. Required: nothing
I have a problem using Kotlin generic and lambda.
Basically I want my interface to have a lambda function on a generic type.
My goal is to make multiple implementation of my class A and then use the ...
- 181
1
vote
1
answer
52
views
How does the reference to "this" get resolved in nested scopes in Kotlin
In the above code snippet, how does Kotlin compiler know that collect in line #10 is to be invoked on the instance of the flow on which merge is invoked?
Isn't this in line #10 referring to ...
- 2,580
0
votes
1
answer
56
views
Prevent modification of original list after placing it in a closure in Kotlin
I don't know closures in Kotlin so I want to understand this aspect. I have a class Foo that holds a list bar, technically immutable. But if I need to change it I create a new list and replace the ...
- 13
0
votes
1
answer
57
views
Why non local return from inline function returns from lambda but proceed inline function execution?
Can't understand kotlin logic. For sush code
inline fun inlined( block: () -> Unit) {
block()
println("hi!")
}
fun foo() {
inlined {
println("5")
...
- 1,041
1
vote
1
answer
39
views
Kotlin labmda invoke alternatve
Assume we have the following code:
fun interface A {
fun a()
}
interface B {
fun b(a: A)
}
fun x(callback: A.() -> Unit) = object : B {
override fun b(a: A) {
a.callback()
...
- 61
0
votes
0
answers
41
views
viewmodelscope.launch not getting called inside lambda kotlin android
I want to insert the VideoUrls object into the database through callback while enqueuing a network request through the volley library in Android just after I obtain the title from the response. Here ...
-1
votes
1
answer
63
views
How to pass 2 arguments lambda as function argument ? Destructuring declarations initializer of type String must have a 'component1()' function
I have a function:
fun foo(arg1: Int, arg2: String, lambda: (String, Int) -> Int): Int {
return arg1 + arg2.length + lambda("123", 1)
}
Nw I want to call it and do following:
fun bar(...
- 36.5k
0
votes
1
answer
86
views
How to Implement main/fallback function pattern in Kotlin?
I want to create function which will try to call main function. If it is ok return the resutl of this function outside. But if it is failed - call another function(fallback function) and return its ...
- 36.5k
1
vote
1
answer
91
views
Lambda value assignment with and without braces into @Composable function
I'm following an Android Developers Codelab. I have this code fragment into a composable:
OutlinedTextField(
value = userGuess,
singleLine = true,
...
- 71
0
votes
0
answers
41
views
Can we use kotlin contracts to specify at least one of the lambda block will be executed in kotlin?
I have a function as follows.
fun handleResult(
onSuccess:() -> Unit,
onFailure:() -> Unit
){
}
Is there a way to specify kotlin compiler that one of the blocks between 2 is sure to be ...
- 420
1
vote
1
answer
171
views
map function returns a list of Unit instead of Char
why this function returns a list of Unit type instead of returning [c,c,c,c] list
fun convert(name:String) {
val list = name.map {
if (it == 'a') {
return@map
} else { it+1 }
}
...
- 23
0
votes
0
answers
32
views
Need help understanding whether internal state of viewModel is automatically updated along with ProtoDataStore
Working on an android app (personal project) with Kotlin and Jetpack.
Using Proto datastore to store application settings/configurations. Using Hilt for D.I.
My code was just working fine with ...
